SIST EN 12952-6:2002

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserrohrkessel und Anlagenkomponenten - Teil 6: Prüfung während der Herstellung; Dokumentation und Kennzeichnung für drucktragende KesselteileChaudieres a tubes d'eau et installations auxiliaires - Partie 6: Contrôle en cours de construction, documentation et marquage des parties sous pression de la chaudiereWater-tube boilers and auxiliary installations - Part 6: Inspection during construction; documentation and marking of pressure parts of the boiler27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12952-6:2002SIST EN 12952-6:2002en01-november-2002SIST EN 12952-6:2002SLOVENSKI
STANDARD



SIST EN 12952-6:2002



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12952-6May 2002ICS 27.040English versionWater-tube boilers and auxiliary installations - Part 6: Inspectionduring construction; documentation and marking of pressureparts of the boilerChaudières à tubes d'eau et installations auxiliaires - Partie6: Contrôle en cours de construction, documentation etmarquage des parties sous pression de la chaudièreWasserrohrkessel und Anlagenkomponenten - Teil 6:Prüfung während der Herstellung; Dokumentation undKennzeichnung für drucktragende KesselteileThis European Standard was approved by CEN on 15 May 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12952-6:2002 ESIST EN 12952-6:2002



EN 12952-6:2002 (E)2ContentsPageForeword.31Scope.42Normative references.43Terms and definitions.53.1inspection.54General organization.54.1General.54.2Conformity assessment.54.3Competency of the manufacturer.54.4Calibration of equipment.54.5Inspection activities.55Non-destructive examination of parent materials.86Approval of welding procedure specification.86.1General.86.2Application of EN 288-3.87Welder and welding operator approval.108Production control test plates for drums.108.1General.108.2Number of production control test plates.108.3Tests required.118.4Acceptance criteria.118.5Non-conformance of results.139Non-destructive examination of welds.139.1Type and extent of non-destructive examination.139.2Qualification of non-destructive examination personnel.179.3The detection of surface imperfections.179.4The detection of volumetric imperfection.219.5Non-destructive examination reports.2510Final inspection.2510.1Visual and dimensional examinations.2510.2Hydrostatic pressure test.2611Documentation.2712Marking.27Annex A (normative)
Chemical recovery boilers.28A.1General.28A.2Special requirements of approval of fusion welding procedure specification.28A.3Special requirements for welder’s approval for fusion welding of composite tubes.29A.4Special requirements for non-destructive testing of welds.29Annex ZA (informative)
Clauses of this European Standard addressing essential safety
requirementsor other provisions of the Pressure Equipment Directive.31Bibliography.32SIST EN 12952-6:2002



EN 12952-6:2002 (E)3ForewordThis document (EN 12952-6:2002) has been prepared by Technical Committee CEN/TC 269 "Shell and water-tubeboilers", the secretariat of which is held by DIN.This European Standard has been prepared under a mandate given to CEN by the European Commission and theEuropean Free Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latestby November 2002.The European Standard EN 12952 concerning water-tube boilers and auxiliary installations consists of the followingparts: Part
1: General. Part
2: Materials for pressure parts of boilers and accessories. Part
3: Design and calculation for pressure parts. Part
4: In-service boiler life expectancy calculations. Part
5: Workmanship and construction of pressure parts of the boiler. Part
6: Inspection during construction, documentation and marking of pressure parts of the boiler. Part
7: Requirements for equipment for the boiler. Part
8: Requirements for firing systems for liquid and gaseous fuels for the boiler. Part
9: Requirements for firing systems for pulverized solid fuels for the boiler. Part 10: Requirements for safeguards against excessive pressure. Part 11: Requirements for limiting devices
of the boiler and accessories. Part 12: Requirements for boiler feedwater and boiler water quality. Part 13: Requirements for flue gas cleaning systems. Part 14: Requirements for flue gas DENOX-systems. Part 15: Acceptance tests. Part 16: Requirements for grate and fluidized bed firing systems for solid fuels for the boiler.CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the manufacturer.Although these Parts can be obtained separately, it should be recognized that the Parts are inter-dependent. Assuch, the design and manufacture of water-tube boilers requires the application of more than one Part in order forthe requirements of the standard to be satisfactorily fulfilled.NOTEParts 4 and
15 are not applicable during the design, construction and installation stages.Annex A is normative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Swe-den, Switzerland and the United Kingdom.SIST EN 12952-6:2002



EN 12952-6:2002 (E)41 ScopeThis Part of this European Standard specifies requirements for the inspection during construction, documentationand marking of water-tube boilers as defined in EN 12952-1.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies (including amendments).EN 287-1, Approval testing of welders — Fusion welding — Part 1: Steels.EN 288-3, Specification and approval of welding procedures for metallic materials — Part 3: Welding proceduretests for the arc welding of steels.EN 288-8, Specification and approval of welding procedures for metallic materials — Part 8: Approval by apre-production welding test.EN 473, Non destructive testing — Qualification and certification of NDT personnel — General principles.EN 571-1, Non destructive testing — Penetrant testing — Part 1: General principles.EN 970, Non-destructive examination of fusion welds — Visual examination.EN 1289, Non-destructive examination of welds — Penetrant testing of welds — Acceptance levels.EN 1291, Non-destructive examination of welds — Magnetic particle testing of welds — Acceptance levels.EN 1321, Destructive tests on welds in metallic materials - Macroscopic and microscopic examination of welds.EN 1418:1997, Welding personnel — Approval testing of welding operators for fusion welding and resistance weldsetters for fully mechanized and automatic welding of metallic materials.EN 1435, Non-destructive examination of welds — Radiographic examination of welded joints.EN 1712, Non-destructive examination of welds — Ultrasonic examination of welded joints — Acceptance levels.EN 1714, Non-destructive examination of welds — Ultrasonic examination of welded joints.EN 10045-1, Metallic materials — Charpy impact test — Part 1: Test method.EN 12952-1:2001, Water-tube boilers and auxiliary installations — Part 1: General.EN 12952-2, Water-tube boilers and auxiliary installations — Part 2: Materials for pressure parts of boilers and ac-cessories.EN 12952-3:2001, Water-tube boilers and auxilliary installations - Part 3: Design and calculation for pressure parts.EN 12952-5:2001, Water-tube boilers and auxiliary installations — Part 5: Workmanship and construction of pres-sure parts of the boiler.EN 25817, Arc-welded joints in steel — Guidance on quality levels for imperfections (ISO 5817:1992).EN ISO 6520-1:1998, Welding and allied processes — Classification of geometric imperfections in metallic materi-als — Part 1: Fusion welding (ISO 6520-1:1998).SIST EN 12952-6:2002



EN 12952-6:2002 (E)53 Terms and definitionsFor the purpose of this Part of this European Standard, the terms and definitions given in EN 12952-1 and the fol-lowing apply.3.1 inspectionconformity evaluation by observation and judgement accompanied as appropriate by measurement, testing orgauging[EN ISO 9000]4 General organization4.1 GeneralThe manufacturer shall be responsible for ensuring the boiler conforms to the requirements of this EuropeanStandard. Conformance shall be confirmed by completing a series of inspection activities as detailed in Table 4.5-1.Except where explicitly stated otherwise in this standard, inspection activities applicable to a manufacturer's worksshall also be applicable to operations carried out on a construction site.4.2 Conformity assessmentGuidance in the use of the conformity assessment procedures is given in EN 12952-1:2001, Annex A.4.3 Competency of the manufacturerIf an assessment of the competency of the manufacturer is required, guidance is given in EN 12952-5:2001, An-nex F.4.4 Calibration of equipmentThe manufacturer shall establish procedures to ensure that tools, gauges, instruments and other measuring andtesting devices used in the manufacture and inspection activities affecting boiler product quality, are properlycontrolled, calibrated and adjusted at specific intervals, to maintain accuracy within defined limits. A system forcalibration in compliance with the EN ISO 9000 series shall be deemed to meet these requirements.4.5 Inspection activitiesThe manufacturer shall confirm that the boiler components, as a minimum, conform to the requirements of thisstandard by performing and authenticating the activities listed in Table 4.5-1.NOTEDepending upon the conformity assessment module adopted, some of the inspection activities listed should also beassessed by a responsible authority. For the guidance of the manufacturer, the specific involvement of such a responsible authorityis indicated in CR 12952-17.SIST EN 12952-6:2002



EN 12952-6:2002 (E)6Table 4.5-1 — List of inspection activities to be undertaken by the manufacturerReferenceArea of activityInspection operation1Design and general documentation1.1Design data/calculationsEnsure that the design data/calculations conform to:— technical specifications, if applicable— the requirements of this European Standard1.2Manufacturing drawingsEnsure that drawing information conforms to:— design data and calculations— technical specifications, if applicable— the requirements of this European Standard1.3Purchase specificationsEnsure that material and component specificationsconform to:— technical specifications, if applicable— manufacturing drawings— the requirements of this European Standard1.4Specifications for sub-contracted partsEnsure that the specification for sub-contracted partsconform to:— technical specifications, if applicable— manufacturing drawings— the requirements of this European Standard2Material2.1Material certificatesVerify that certificate information and results conformto the design specification2.2Welding consumablesVerify that the consumables to be used are inaccordance with the design specification2.3Material identificationIdentify the material with the material certificates andcheck the markings2.4Transfer of identification marksEnsure that the transfer of identification marks is inaccordance with the approved procedure2.5Acceptance of sub-contracted partsVerify that sub-contracted parts conform to themanufacturer's specification3Fabrication and welding3.1Welding procedure specificationsVerify that appropriate welding specifications areavailable and that their contents are compatible withthe welding procedure approvals3.2Welding procedure approvalsVerify that the welding procedures are appropriatefor
the materials and the field of welding application,and that they have been approved by a responsibleauthority3.3Welder approvalVerify that the welder approvals have been approvedby a responsible authority and that they are availableand valid3.4Forming proceduresVerify that forming procedures are available, whereapplicable, and their contents are appropriate to theproduct to be formed3.5Weld preparationsExamine material cut edges where thermal cuttinghas been used and confirm machined preparationsare to the correct profileSIST EN 12952-6:2002



EN 12952-6:2002 (E)7Table 4.5-1 (continued)ReferenceArea of activityInspection operation3.6Formed partsExamine formed parts in accordance with the require-ments of EN 12952-5:2001, clause 73.7Weld seam set upExamine set up of seams for welding, includingdimensional check3.8Weld rootExamine second side of weld preparation, if appli-cable, after the first side of weld has been completedand the root cleanedIdentify and mark production test platesVerify that any PWHT on production test plates inde-pendent of the component complies with the specificheat treatment applied to the componentExamine NDE reports on production test platesIdentify and mark the test specimens taken from pro-duction test plates for mechanical tests3.9Production test plates, if anyVerify that the test information and results from themechanical tests conform to the requirements of thisEuropean Standard4Non-destructive examination of welds4.1Non-destructive examination proce-duresVerify that appropriate non-destructive examinationprocedures are available and ensure the qualificationof the originator is appropriate4.2Non-destructive examination opera-tor qualificationsEnsure the non-destructive examination operator'squalifications are appropriateScrutinise any radiographs and check conformance tothe acceptance criteria4.3Non-destructive examination opera-tionScrutinise the operator's ultrasonic examinationreports4.4Non-destructive examination reportsVerify that the information and results conform to theacceptance criteria5Post-weld heat treatment (PWHT)5.1PWHT proceduresVerify that the post-weld heat treatment proceduresconform to this European Standard5.2PWHT recordsVerify that temperature/time recordings conform to therequirements of this European Standard6Final inspection and marking6.1Pre-hydrostatic pressure test inspec-tionCarry out dimensional checking, visual examinationand identification of accessible parts after componentcompletion, prior to hydrostatic pressure test6.2Hydrostatic pressure testEnsure the final hydrostatic pressure test is carried outin accordance with the requirements of this EuropeanStandardPerform visual examination on completion of thehydrostatic pressure test6.3Post-hydrostatic pressure testinspectionCheck marking on nameplate6.4Safety devicesEnsure the provision of safety equipment6.5Manufacturer's data dossierEnsure completeness of the data dossier — seeclause 11SIST EN 12952-6:2002



EN 12952-6:2002 (E)85 Non-destructive examination of parent materialsThe NDE of parent materials shall be in accordance with EN 12952-2.6 Approval of welding procedure specification6.1 GeneralThe welding procedure specifications shall be approved for all welds in components forming the pressure circuit orattached to that circuit.For application to water-tube boilers, these approvals shall be in accordance with EN 288-3 or EN 288-8 as appro-priate. Approval records and fusion welding procedure specifications shall be approved as part of the designapproval process. The general rules of EN 288-3 shall be supplemented for the purpose of this European Standardby application of the specific rules detailed in 6.2.The manufacturer shall supply, as part of the technical documentation, a list of all the welding procedure specifica-tions required for the fabrication of the water-tube boiler.Where a manufacturer can furnish proof that he has previously carried out successful procedure approval tests inaccordance with the requirements of this European Standard, he shall be deemed exempt from the necessity forre-approval within the essential variables covered by the previous test.NOTEA document on ‘Flash butt welding procedures’ is in preparation. See Bibliography.In addition to the requirements of EN 288-8, procedure qualification test for welded water-tube wall constructionshall comply with the requirements of EN 12952-5:2001, Annex A.6.2 Application of EN 288-36.2.1 Tests requiredThe welding procedure approval tests shall be in accordance with the requirements of EN 288-3.In addition, the following requirements shall be met for drums and headers made from steel groups 1, 2.1, 4 or 5:a) Boiler drums: For longitudinal and circumferential welded joints in drums of thicknesses greater than 20 mm,the welding procedure approval test shall include a longitudinal tensile test on weld metal. This test shall beperformed at not less than the following minimum temperatures:250 °C for steel group 1;350 °C for steel group 2.1, 4 or 5.b) Headers: For headers containing longitudinal welds having a thickness greater than 20 mm, the welding pro-cedure approval test for the longitudinal welds shall include a longitudinal tensile test on weld metal. This testshall be performed at not less than the following minimum temperatures:250 °C for steel group 1;350 °C for steel group 2.1, 4 or 5.SIST EN 12952-6:2002



EN 12952-6:2002 (E)96.2.2 Mechanical tests6.2.2.1 GeneralAll mechanical tests performed during the welding procedure qualification shall be carried out in accordance withEN 288-3.The Charpy V-notch impact tests shall be carried out at room temperature in accordance with EN 10045-1.The test values to be achieved shall be as defined in EN 288-3 and 6.2.2.2 to 6.2.2.5.6.2.2.2 Longitudinal tensile test on weld metalThe test result shall meet the specified minimum Rp0.2 value for parent material at testing temperature (see 6.2.1).6.2.2.3 Transverse tensile testThe test results shall meet the following requirements, depending on the position where the fracture occurs duringthe test: if the fracture occurs in base material, the minimum ultimate tensile strength specified for the relevant basematerial used for the qualification; if the fracture occurs in the weld, the minimum ultimate tensile strength specified for the relevant base materialused for the qualification, or, for designs based on the Rp0.2 proof stress, 90 % of the minimum ultimate tensilestrength specified for the relevant base material used for the qualification.6.2.2.4 Charpy V-notch impact testsThe test results shall meet the following requirements, depending on the base material and the position where thetests are performed:a) For ferritic steels:1) Charpy V-notch impact test in the weld deposit: minimum average value: the average value specified for the base material used in the weldingprocedure approval at the test temperature (room temperature); minimum single value: one single value may be lower than the value required for the minimumaverage value, but shall not be less than 70 % of the minimum average value;2) Charpy V-notch impact tests in the heat affected zone: minimum average value of 27 J, except for steel group 6 where 24 J is permitted; minimum single value: one single value may be lower than the value required for the minimumaverage value, but shall not be less than 21 J, or 19 J for steel group 6;b) For austenitic steels:Impact testing shall not be required for austenitic steels.6.2.2.5 Hardness surveyDepending on the base material and whether post-weld heat treatment is required in accordance withEN 12952-5:2001, 10.4, hardness values shall be as specified in EN 288-3.For non-heat treated steel group 5, the maximum value shall not exceed 380 HV10.SIST EN 12952-6:2002



EN 12952-6:2002 (E)10Provided that the ductility of the weld has been adequately demonstrated in accordance with the bend tests asspecified in EN 288-3 and the impact tests as specified in 6.2.2.4, local deviations in the heat affected zone hard-ness values shall be acceptable.6.2.2.6 Dissimilar base material jointsIn the case of dissimilar base material joints, the weld metal values shall meet the lower of the specified minimumvalues for the parent material as required in 6.2.2.2, 6.2.2.3 and 6.2.2.4.7 Welder and welding operator approvalAll welders and welding operators engaged on the welding of pressure parts of water-tube boilers fabricated inaccordance with this European Standard shall pass the welder approval tests which are designed to demonstratetheir ability to make sound welds of the types on which they are to be employed.Approval testing of welders and welding operators shall be carried out, recorded and reported in accordance withEN 287-1 or EN 1418:1997, 4.2.1 and 4.2.2, as appropriate. Verification of approval of welders testing shall be partof final inspection. The general rules of EN 287-1 or EN 1418:1997, 4.2.1 and 4.2.2 shall be fully applied, as appro-priate.When a welder or and welding operator is approved according to EN 287-1 or EN 1418:1997, 4.2.1 and 4.2.2, asappropriate, for the welding of butt welds, no additional approval shall be required for the welding of branches, noz-zles or attachments, provided that the welding operations are carried out in the range of approval of the welder orand welding operator approval given in EN 287-1 or EN 1418:1997, 4.2.1 and 4.2.2 as appropriate.A list of welders and welding operators, together with records of their approval tests, shall be retained by themanufacturer who may be required to provide evidence of approval of any welder engaged in the fabrication ofwater- tube boilers.8 Production control test plates for drums8.1 GeneralThe material used for production control test plates shall comply with the same standard and grade, or the samespecification, as that used for the construction of the drums of the water-tube boiler. As a minimum, plates shall befrom the same steel making process and of the same nominal thickness as the drum plates. Where possible, theplates shall be selected from the same cast as that used for the manufacture of the drum.The dimensions of the test plates shall be large enough to allow the preparation of all the test specimens requiredby 8.3.2, and in no case shall their length be shorter than 350 mm.The test plates shall be attached, wherever practical, to the drum plate so that the weld carried out on the produc-tion control test plate is a continuation of the longitudinal seamweld.Production control test plates shall receive an identical post-weld heat treatment or stress relief as that applied tothe production weld.8.2 Number of production control test platesThe number of production control test plates required shall be as follows:a) longitudinal welds: One production control test plate per welding procedure approval per drum and perheaders;b) circumferential welds: If the welding procedure approval is the same as that for the longitudinal seam of thedrum, no additional production control test plate is required. If the welding procedure approval differs from thatof the longitudinal seam, then one production control test plate shall be performed per welding procedure ap-proval per year.SIST EN 12952-6:2002



EN 12952-6:2002 (E)118.3 Tests required8.3.1 Non-destructive examinationThe test plates shall be subjected to non-destructive examination identical with the production welds they arerepresenting.8.3.2 Destructive testsThe test plates and methods of testing shall be in accordance with the requirements of EN 288-3 for weldingprocedure approval.The following destructive tests shall be performed on each production control test plate:a) 1 transverse tensile test at room temperature;b) 1 longitudinal tensile test on weld metal for production control tes
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